Moderna (MRNA) – The biotech company announced positive interim data from a phase 1 study of its novel coronavirus vaccine candidate. Moderna said dose-dependent increases in immune responses were seen across three different dose levels, and that the treatment was generally safe and well-tolerated.

Goldman Sachs (GS) – Warren Buffett's Berkshire Hathaway sold most of its holdings in Goldman, according to Berkshire's quarterly 13F filing. Berkshire's sale of Goldman shares brings its holdings down to 1.9 million shares from more than 10 million, cutting its stake to about 0.6%. Berkshire had invested $5 billion in the Wall Street stalwart during the 2008 financial crisis.

Uber (UBER), Grubhub (GRUB) – The Wall Street Journal reports the CEOs of both companies met over the weekend to continue merger discussions, as they try to work out a stock-swap deal that would combine Uber's delivery service, Uber Eats, with Grubhub. Grubhub continues to maintain that Uber's current offer is too low.

Under Armour (UAA) – Allianz chief economic advisor Mohamed El-Erian was named lead independent director, effective at the athletic apparel maker's annual meeting on May 27. El-Erian has been an Under Armour board member since 2018.

Alphabet (GOOGL) – Alphabet's Google unit will be the target of likely antitrust lawsuits from the Justice Department and state attorneys general, according to The Wall Street Journal. The suits will focus on Google's dominance in both the advertising business and in online search.

T-Mobile US (TMUS) – Japan's Softbank is in talks to sell a significant portion of its stake in the wireless operator to controlling shareholder Deutsche Telekom, according to The Wall Street Journal. Such a transaction would boost Deutsche Telekom's share from nearly 44% to over 50%.

International Game Technology (IGT) – The maker of electronic gaming equipment and software earned 8 cents per share for its latest quarter, beating the 3 cents a share consensus estimates. Revenue fell short of forecasts. The company said the impact from Covid-19 began to set in during March, amid closures of casinos and gaming halls, but IGT said it has sufficient liquidity to weather the pandemic.

Tesla (TSLA) – Tesla has zeroed in on two locations in Texas and Oklahoma as possible sites for a new factory, according to a source intimately familiar with the automaker's plans who spoke to CNBC.

Best Buy (BBY) – Best Buy was upgraded to "outperform" from "market perform" at Telsey Advisory Group, which expects the electronic retailer to benefit from the shift to working at home and increased consumer adoption of e-commerce.

J.C. Penney (JCP) – The retailer filed for Chapter 11 bankruptcy protection, with plans to hand control to lenders and split into two separate companies. One would hold the retail operations, while the other would be a real estate investment trust holding some of the company's property.

Walt Disney (DIS) – Disney will reopen part of the shopping area at its Disney Springs resort in Florida on Wednesday. The company is implementing a variety of safety measures, including masks and contactless payment options.

Fiat Chrysler (FCAU) – Fiat Chrysler is in talks to set up a $6.8 billion credit line that will be guaranteed by the Italian government. The automaker is trying to shore up its finances as it deals with the impact of the coronavirus outbreak as well as proceed with its planned merger with Peugeot parent PSA Groupe.

Cinemark Holdings (CNK) – Cinemark was downgraded to "neutral" from "buy" at B Riley FBR, which points to a variety of negative factors for the movie theater operator including a worsening coronavirus situation in Brazil.